PLATE V. 



Tigs. pagk 



1,2. Gonularia planiseptata, sp. nov. Mrs. Gray's Collection . 35 



1 a. Specimen from the Upper Bala of Thraive Glen. 1 b. Apical septum, 



showing siphuncle (?). x 2. 



2 a. Ornamentation of another specimen from the same locality, x 10. 2 b. 



The same. X 20. 



3 — 6. Gonularia vesicularis, sp. nov. . . . .30 



3. Imperfect specimen from the Bala of Acton Scott. Museum of Practical 



Geology, no. 12647. 

 4 a. Cross-section of another specimen at the aperture, x 2. 4 6. The same 



at the apex, x 2. 



5. Ornamentation, x 10. 



6. Different appearances of ornamentation, x 20. 6 a. Ridges well pre- 



served. 6 b. Ridges worn, and rounded hollows prominent. 6 c. Shell 

 all removed, and internal cast left. 



7 — 11. Gonularia sowerbyi, de Verneuil . . . .37 



7 a. Specimen from the Wenlock Limestone of Dudley, ending in a broken 

 apical septum. 7 b. Portion of broken apical septum, x 5. British 

 Museum (Nat. Hist.), no. 6327. 



8. Imperfect aperture of another specimen. Museum of Practical Geology, 



no. 12504. 



9. Complete apical septum of another specimen. Museum of Practical 



Geology, no. 11799. 

 10 a. Marginal groove, x 5. 10 6. Portion showing inner layer of shell, x 5. 

 11. Ornamentation. x 10. 



12, 13. Gonularia breviconventa, sp. nov. . . . .39 



12 a. Specimen from the Wenlock Limestone of Dudley. 12 b. Ornamenta- 

 tion, x 5. 12 c. The same, x 10. British Museum (Nat. Hist.), 

 no. G. 17667. 



13. Marginal groove of another specimen, x 5. 



14. Gonularia elegans, sp. nov. British Museum (Nat. Hist.), no. 



G. 17665 . . . . . .39 



14 a. Small specimen from the Carboniferous Limestone of Fallow, Salop. 

 14 b. Ornamentation. x 10. 14 c. The same. x 20. 



